A problem-solving system (usually refereed to computation theory, but applicable to other fields such as mathematics) that involves testing every single possible solution to a problem in order to find the right one.

To bypass the system security John Doe used a brute force method, he tested all possible passwords with a bot.

The method of solving a task by testing all posible combinations. Used mainly by computers preforming portscans, paswordbrakers and prime numbers detection.
Humans can use this method aswell to solve problems, but it's best suited for computers due to it's 'boring' nature.

Bruteforce used to get to a special page in a book.

Reading a book form the start, read what page you are on and the turn to the next page. Then stop when you are at the right page.

Non-bruteforce solving of the same problem.
Do an estimation of where the page might be. Open the book at that page. Read the page number of that page and do a new estimation till you are at the desierd page.

A problem-solving system (usually refereed to computation theory, but applicable to other fields such as mathematics) that involves testing every single possible solution to a problem in order to find the right one.

To bypass the system security John used a brute force method, he tested all possible passwords with a bot.